Attachment for disk grinding-machines.



RAN. & F. E. GARDNER. ATTAGHMBNT FOR'DISK GRINDING MACHINES.

' ArrLoAToN FILED JULY 2s, 1910.v

Patentd Auges, 1911.

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P. N. & F. E. GARDNER. ATTACHMENT FOR DISK. GRINDING MACHINES. v

Y APPLICATION FILED JULY 26, 1910.

LOCLlSS. t Patented Aug.22,1911.

` .l Y ZBHEETS-SBEETZ.

@n/J E invention.

Auniri;'D srATns riferi-infr onirica.

FREDERICK N. GARDNER AND FREDERIC E. GARDNER, OF BELOIT, WISCONSIN, ASSIGN- ORS OF ONE-THIRD T0 LOUIS WALDO THOMPSON,

OF BELOIT, WISCONSIN.

ATTACHMENT FOR DISK GRINDING-MACHINES.

To all whom it may concern:

Be it known that we, FREDERICK N. GARD- .Nrn and FREDERic E. GARDNER, citizens of the United States, residing at Beloit, in the county of Rock and State of Wisconsin, have invented certain new and useful Iniprovements in Attachments for Disk Grinding-Machines, of which the following is a specification.

This invention contemplates anattachment Jfor disk grinding machines of the type disclosed in our prior application, Serial No. 528,791, led November 18, 1909. rThe machine shown'in said application is especially adapted for grinding or surfacing wood, and is particularly intended for use. by pattern-makers.

The object of this invention is to provide a gage attachment for disk grinding machines by means of which a number of pieces oi? work may be easily, rapidly and accurately ground down to the same size, as to one or more dimensions; or may be ground so that the faces of each piece extend exactly the same angle to one another as Vthose of the other pieces. In other words, it is the object of our invention te provide an attachment by which a piece of work may be rapidly' and accurately reproduced any desired number of times. Y

'ln the accompanying drawings, Figure 1 is a fragmental side elevation of a disk grinding machine having an attachment thereon embodying the features of our Fig. 2 is va plan view of the attzwhment, a portion of the table of the Amachine being broken away. vview similar to Fig. 2 but showing the Fig. 3 is a attachment in a different position. Figs. 4. 5 and 6 are sections on lines 4: f1, 5 5 and 6 6, respectively, of Fig. 3. Figs.'7 and 8. lare perspective views of two pieces oi work which the attachment is adapted to handle.l

The machine illustrated in Fig. 1 comprises a suitable base 1 having bearings 2 thereonin which is mounted a shaft carrying a drive pulley 4t. Fixed on one `end ot the shaft 3 is a disk 5 to the outer face Specification of Letters Patent Patented Aug 2 2, 1911, Application filed July 26, 1910. Serial No.A 573,824. i

of which is secured a sheet of sand paper or other abrasivematerial. A segment 6 having a groove -7 therein is iiXed to a member 8 which is vertically slidableupon the base l 1. Said member is attached to one end ofa cable 9 passing over a .sheave 10, the other end of said cable carrying a counter-balancing weight (not shown). The work table 11 is-carried by a segment 12 having a curved rib onits inner face which travels in the groove 7 in the segment 6. The segments 6 and 12 are secured together by means of bolts 13 passing through the segment 6 and .through arcuateslots 14 in the segment v12said bolts having nuts 15 turned thereon.

It will be seen that the Woik table 11 may be tilted either upwardly or downwardly from a horizontal position into planes at various angles with the disk 5. The inner edge of said table is beveled, as shown, vto permit such tilting movement. 'The center of the arc upon which the groove-7 is formed is a point which lies close to the abrading surface of the disk 5 and coincides with the innermost portion of the beveled edge of the table 11.l The movement of the segment 12 being a rotative one, and the axis of rotation being coincident. with the inner upper edge of the work table, -it will be seen that `the work table may be tilted without changing the position of the inner edge thereof. To clamp the table in the desired position one of the nuts 15..-may be turned up tightly by means of a handle 16 formed thereon.

An attachment embodying our invention may comprise a bar 17 adapted to slide in a groove 18 formed in the face of the work table 11 and extending parallel to the face otv the disk 5. Fixed upon the upper side `of the bar 17 is a plate 19. The plate 19 has a slot 20 extending therethrough vat right angles to the groove 18. In the present instance the plate 19 is formed in two duplicate pieces to forni'the slot 20. Slidably mounted in the slot 20 is a bar. 21.

spaced apart on the bar 17' A gage plate 22 is pivoted to the inner end of the bar 21 to swing in a plane,par-y yt l which the gage plate 4`(allel to the work table by means -of a bolt 23 fixed in said strip 21 and extending upwardly through a bearing 24 on the gage plate, said bolt having a nut 25 threaded on its upper end. The gage plate 22 may coinprise a base portion 22a adapted to Contact the ntace of the plate 19, and a perpendicular portion 22b adapted to bear againstthe work to hold it against the grinding .disk

Strengthening ribs 26 may beprovided, if'

any desired position.

30 isa protractor by meansof which the angle of the gage 22 may be determiped.

The bar 21 may have'a Zero line 81 thereon.

' A stop screw 32 threaded in a member 33 carried by the bar 21 is arranged to engage the outer edge ofthe work table 11 and llmit the inward movement ot the bar 21 andgage 22. The member 33 is slidably mounted on the bar 21 so that it may remain adjacent to the edge of the work table 11 regardless of whether the gage plate v22 is close to the abrading disk 5 or at a distance therefrom. A bolt 311 slidably mounted in the member B3 has at one end a projection 85 lying ina groove 36 in the under side of the-bar 21,

the other end of said bolt having -a nut 37 thereon adaptedto clamp the member 33 adjusted position upon the bar 21'.

lnFig. 7, we have shown a sample piece .of work in the form of a segment a such as is generally used in making pulley patterns and the like. By' means of the attachment herein disclosed it becomes possible to grind l any number of sudh segments tol exactly the same thickness, so that when the proper number are glued together at their ends they match up perfectly without further finishing of their sides to form the complete ring.

Heretofore it has'been the practice to first glue the segments together to form a ring and, after waiting for" the glue to set,

face oii the ring on a lathe.. By our attachment, however, the segments can be made exact duplicates of each other in thickness, thereby eliminating the -lathev operation arbove mentioned and saving a very large ercentage of the labor formerly required.

yn vgrinding suc-h a segment upon the Amachine herein shown, the vgage 22 is set moved outwardly a short distance and a vsegment is laid on the plate 19' between the with the perpendicular face -22b parallel to the face of the disk 5. The gage is then may be clamped in.

gage and the grinding disk 5 with the conveg; side of the segment up. Wienjhe stop screw v32 has been adjusted so as to limit inward movement of the gage at the properk point, said gage is moved inwardly to carry the work against the grinding disk 5. ,They stop screw 32 .comes into contact with the edge of the work table 11 when the piece of work has been ground down to the thickness desired. v v Fig. 8 illustrates another piece of Work in the form'of a stave b having beveled tapering sides. To finish' this stavev the gage plate 22 is set at the proper anglewith reference to the face ofthe disk 5, and the stop,

screw 32 is adjusted to limit inward movef ment of the gage plate at the desired point. The work table 11 may be tilted as a whole fromlits horizontal position as hereinbefore Adescribed to produce the desired bevel upon the sides of the piece of work.

In' the pattern-making art, it becomes necessary very `frequently to duplicate pieces of widely varying size and shape such as' is shown in Fig. 8. Heretofore this has groovev 18 over the entire face of the disk.

This is important since it'permits of utilizing the entire grinding surface of the disk. i

If the cutting is conlined to one space on theWTUM grinding disk, the abrading material at this space becomes illed'with the fine wood dust,

thus materially reducing its cutting action.

'We claim as our invention: l. In a disk grinding machine, the combination of a rotary grinding/disk; a. work table adjacent the face of' said disk, said table having a groove therein parallel with the face of said disk; a bar slidable in said groove; a plate fixed to said bar; a second bar mounted on said plate and being slidable therein in a line perpendicular to the firstbar; a gage plate adjustably carried by the 'inner end of said second bar; and means for lOimiting inward movement of said 'second 2. In a disk grinding machine, the'eombination of a rotary grinding disk; a work table supported adjacent said'disk, said Itable having a groove therein parallel with said disk; a bar slidable. in said groove; a plate fixed to said bar and having a slot -therethrough perpendicular to said groove; a second -bar slidable in said slot; a gage 'plate pivoted on the inner end of said second bar and having an arcuate slot thereinpastud fixed in said second bar and projecting ment of said second bar; and means for fixthrough said slot; a nut threaded on -sand ing said member to said second bar.

stud and being adapted to chimp-said gage 1 EREDERICK N. GARDNER. plate in adjusted position; a member sld- FREDERC E. GARDNER. able on the Second bar; a stop screw carried itnessesz by said member and adapted to engage the 1 H N. ADAMS,

edge of the Work table to limit inward movel Cixmzm, HICKsoN.

Copies of this patent may be obtaineA for five cents each, 'by addressing the Commissioner ot' Patents.

Washington, D. C. 

